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RISC-V: Add early printk support via the SBI console
This code lives entirely within the RISC-V arch code. I've left it within an "#ifdef CONFIG_EARLY_PRINTK" despite always having EARLY_PRINTK support on RISC-V just in case someone wants to remove it. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
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1 changed files with 27 additions and 0 deletions
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@ -39,6 +39,27 @@
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#include <asm/tlbflush.h>
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#include <asm/thread_info.h>
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#ifdef CONFIG_EARLY_PRINTK
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static void sbi_console_write(struct console *co, const char *buf,
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unsigned int n)
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{
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int i;
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for (i = 0; i < n; ++i) {
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if (buf[i] == '\n')
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sbi_console_putchar('\r');
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sbi_console_putchar(buf[i]);
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}
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}
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struct console riscv_sbi_early_console_dev __initdata = {
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.name = "early",
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.write = sbi_console_write,
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.flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
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.index = -1
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};
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#endif
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#ifdef CONFIG_DUMMY_CONSOLE
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struct screen_info screen_info = {
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.orig_video_lines = 30,
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@ -195,6 +216,12 @@ static void __init setup_bootmem(void)
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void __init setup_arch(char **cmdline_p)
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{
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#if defined(CONFIG_EARLY_PRINTK)
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if (likely(early_console == NULL)) {
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early_console = &riscv_sbi_early_console_dev;
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register_console(early_console);
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}
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#endif
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*cmdline_p = boot_command_line;
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parse_early_param();
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